Nobel prize-winning psychologist Ivan Pavlov (1849-1936) gives a description of brain activity that eerily echoes the results of modern brain scanning studies.
The quote is from a lecture given in 1913 and published on p222 of the book Lectures on Conditioned Reflexes: Twenty-Five Years of Objective Study of the Higher Nervous Activity Behavior of Animals.
“If we could look through the skull into the brain of a consciously thinking person, and if the place of optimal excitability were luminous, then we should see playing over the cerebral surface, a bright spot with fantastic, waving borders constantly fluctuating in size and form, surrounded by a darkness more or less deep, covering the rest of the hemisphere.”
Mind Hacks 